Don't forget to take a ruler and calculator into the exam.
Maths questions often start with command words like 'Calculate...' 'Determine...', 'Estimate...' and 'Measure...'. They will then include blank space for you to show your working.
When an answer to a maths question is marked:
Errors are carried forward if a later working depends on an earlier answer. You could still get marks if your working is correct but you use the incorrect earlier answer.
If your answer has many decimal places or figures, make sure you give it to an appropriate number of decimal places or significant figures. You may be asked to give units. This may earn you an additional mark, so don’t forget to check whether you need to do this.
Maths questions might ask you to plot or complete a graph or table. When you draw a graph, make sure you:
You may be given a grid with axes labelled and scales already given. Sometimes you may be given an empty grid for you to supply your own axes. When you do this:
Edexcel questions courtesy of Pearson Education Ltd.
The table shows information about some of the elements in group 7 of the periodic table.
|Element||Melting point||Boiling point|
Astatine is below iodine in group 7 of the periodic table.
Estimate the boiling point of astatine. [1 mark]
Any temperature greater than 184°C. 
The table shows some of the gases in group 0 and some of their properties.
The gases are shown in the order in which they appear in group 0.
Complete the table. [3 marks]
|Gas||Symbol||Density||Reaction with metals|
|Helium||He||0.12 g/dm3||No reaction|
|Neon||Ne||1.44 g/dm3||No reaction|
|Krypton||3.00 g/dm3||No reaction|
Some metals react with halogens.
Iron reacts with bromine, Br2, to form iron(III) bromide, FeBr3.
Write the balanced equation for this reaction. [2 marks]
Write the balanced equation for the reaction of sodium with water. [3 marks]